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The upcoming Republican state convention in Texas may consider the topic of the state’s secession from the United States. Here’s a look at what practical and constitutional barriers would prevent that.

Lyle Denniston, the National Constitution Center’s constitutional literacy adviser, looks at the Justice Department’s stance on Puerto Rico’s sovereignty, which will get tested twice in the Supreme Court this year.

Lyle Denniston, the National Constitution Center’s constitutional literacy adviser, looks at a case about Puerto Rico’s sovereignty just accepted by the Supreme Court and the Fifth Amendment concept of double jeopardy.